Browse Forums General Discussion Re: Rust colour stain on plaster walls 3Oct 28, 2021 7:54 pm Whenever steel and other metals containing iron are regularly exposed to oxygen and moisture, they form rust. Very common on rendered homes Smaller suppliers get the lower quality raw materials 6 12250 THanks , l got a licensed building inspector to look at the rust, he said its just surface rust and it would take many years to become a problem because the beams are so… 22 28760 if l cannot get a sandblaster would a sander with sandpaper be better then a wire brush 4 7682 |